Supported multimetallic catalysts for oxidative dehydrogenation of alkanes
A catalyst for oxidative dehydrogenation of alkanes includes a substrate including an oxide; at least one promoter including a transition metal or a main group element of the periodic table; and an oxidation-active transition metal. The catalyst is multimetallic.
1. A method of synthesizing a catalyst for oxidative dehydrogenation of alkanes, the method comprising:
providing a substrate comprising an oxide;
depositing at least one promoter onto the substrate to form an intermediary comprising the promoter dispersed on at least a portion of the substrate, the at least one promoter selected from the group consisting of Cr, Zr, Ni, and V; and
depositing an oxidation-active transition metal onto the intermediary to form the catalyst having the oxidation-active transition metal dispersed on at least the promoter, the oxidation-active transition metal comprising Mn,
wherein the catalyst is formulated to provide a propylene yield in a range of approximately 7% to approximately 15% at a temperature of 500 degrees Celsius.
2. The method of claim 1 , wherein the substrate is selected from the group consisting of SiO 2 , Al 2 O 3 , TiO 2 , and ZrO 2 .
3. The method of claim 1 , further comprising doping the catalyst with an element selected from the Group I elements of the periodic table, the Group II elements of the periodic table, or the main group elements of the periodic table.
4. The method of claim 1 , wherein the oxidation-active transition metal is impregnated in a surface of the at least one promoter.
5. The method of claim 1 , wherein the oxidation-active transitional metal is formed on a surface of the at least one promoter.
6. The method of claim 1 , wherein:
the at least one promoter is deposited on the substrate via atomic layer deposition; and
the oxidation-active transition metal is deposited on the intermediary via atomic layer deposition.
7. The method of claim 1 , wherein:
depositing the at least one promoter onto the substrate comprises performing solution-phase organometallic grafting or electrostatic adsorption; and
depositing the oxidation-active transition metal onto the intermediary comprises performing solution-phase organometallic grafting or electrostatic adsorption.
8. The method of claim 1 , wherein the promoter has a specific surface coverage of a monolayer of 10% to 100%.